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15th International Conference on Computer Research and Development, ICCRD 2023

作者： Yang, Yang Dai, Shuling Lei, Xiaoyong Beihang University State Key Lab. of Virtual Reality Technology and Systems Beijing China

ISBN: (纸本)9781665487504

Engine aerodynamic noise is a complex component of flight simulation, consisting of multiple groups of harmonics and broadband noise signals based on passing frequency. Harmonic simulation can effectively convey human auditory perception but lacks related study in flight simulation. To accurately simulate the acoustic behavior of harmonic noise, first, a high-order cumulant based pre-filtering method is applied to retrieve harmonic signals from the real engine noise recordings by exploiting the blindness of the third-order cumulants to the harmonic signal. Then, targeting the lower precision of the autoregressive (AR) coefficients in the pre-filtering calculations, a maximum likelihood method is proposed to estimate the ARMA parameters of the high-order cumulants. The simulation results show that the accuracy of AR parameter estimation is significantly improved compared to the moment estimation method. Finally, the exact frequency is verified and obtained based on first-order cyclic statistics, and then the harmonic signal in the time domain is extracted. © 2023 IEEE.

关键词： Aerodynamics

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A Metal Surface Damage Recognition Method For Augmented reality Assisted Maintenance systems

A Metal Surface Damage Recognition Method For Augmented Real...

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2024 IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 2024

作者： Wu, Hongduo Zhou, Dong Guo, Ziyue Wang, Yan Zhou, Qidi School of Reliability and System Engineering Beihang University Beijing China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9798350386097

The small damages such as cracks and scratches on the surface of aerospace products pose a serious threat to the safety of life and property, and manual visual inspection is prone to omissions, leaving great safety hazards. Using augmented reality (AR) assisted maintenance systems to assist visual inspection is one of the effective solutions. However, the limitations of computing power in augmented reality devices and the real-time requirements of augmented reality pose significant challenges to small-scale object detection algorithms. Therefore, this paper proposed a metal surface damage recognition method for augmented reality assisted maintenance system. Firstly, for the appearance characteristics of surface damage in the steel image database NEU-CLS, the histogram equalization was employed for image enhancement to improve image quality. Afterwards, a SURF + K-means + Bag-of-Features + the-number-of-feature-points feature extraction and dimensionality reduction method was proposed to improve recognition efficiency while ensuring the robustness of the method. Finally, adaptive boosting learning framework was utilized to construct a surface damage recognition model which has good accuracy and efficiency for common metal surface damages. © 2024 IEEE.

关键词： Dimensionality reduction

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VibroArm: Enhancing the Sensation of Forearm Deformation in virtual reality Using Vibrotactile Funneling Illusion 23

VibroArm: Enhancing the Sensation of Forearm Deformation in ...

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23rd IEEE International Symposium on Mixed and Augmented reality, ISMAR 2024

作者： Lin, Yilong Xie, Tianze Chang, Yingjie Luo, Hu Wang, Dangxiao Je, Seungwoo Southern University of Science and Technology School of Design China Beihang university State Key Lab of Virtual Reality Technology and Systems China

ISBN: (纸本)9798331516475

When we enter virtual reality (VR) in the first person, the avatar replaces our real body. Within a certain range of mismatches, we tend to identify with our avatar and perceive it as our own body. Previous research has shown that we can even believe that a deformed forearm is our own through haptic and visual feedback. However, the haptic devices used in earlier research were only explored using skin-stretching and weight-shifting. Vibrotactile feedback is the most common technique used to create a haptic VR experience in academia and industry because of its light weight and ease of application. Taking these advantages, we introduce VibroArm, a lightweight wearable haptic system with the vibrotactile funneling illusion that enhances the virtual forearm's ownership in the forearm deformation illusion. In a perceptual study, we determined that users can make correct direction judgments about vibration on the forearm in different directions. The result shows that all vibration patterns can be sufficiently recognized, with an average recognition rate of $87.17 \%$. Based on our results, we designed 18 vibration patterns and compared their impact on the forearm deformation illusion. Finally, our study shows that using VibroArm in VR applications can significantly improve user realism and enjoyment compared to relying on visual feedback alone. © 2024 IEEE.

关键词： virtual environments

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Active electronic skin:an interface towards ambient haptic feedback on physical surfaces

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npj Flexible Electronics 2024年第1期8卷 684-710页

作者： Yuan Guo Yun Wang Qianqian Tong Boxue Shan Liwen He Yuru Zhang Dangxiao Wang State Key Lab of Virtual Reality Technology and Systems BeijingChina School of Mechanical Engineering and Automation Beihang UniversityBeijingChina Department of Strategic and Advanced Interdisciplinary Research Peng Cheng LaboratoryShenzhenChina

In the era of ubiquitous computing with flourished visual displays in our surroundings,the application of haptic feedback technology still remains in its *** the gap between haptic technology and the real world to enableambient haptic feedback on various physical surfaces is a grand challenge in the field of human-computer *** paper presents the concept of an active electronic skin,characterized by three features:richness(multi-modal haptic stimuli),interactivity(bi-directional sensing and actuation capabilities),and invisibility(transparent,ultra-thin,flexible,and stretchable).By deploying this skin on physical surfaces,dynamic and versatile multi-modal haptic display,as well as tactile sensing,can be *** potential applications of this skin include two categories:skin for the physical world(such as intelligent home,intelligent car,and intelligent museum),and skin for the digital world(such as haptic screen,wearable device,and bare-hand device).Furthermore,existing skin-based haptic display technologies including texture,thermal,and vibrotactile feedback are surveyed,as well as multidimensional tactile sensing *** analyzing the gaps between current technologies and the goal of ambient haptics,future research topics are proposed,encompassing fundamental theoretical research on the physiological and psychological perception mechanisms of human skin,spatial-temporal registration among multimodal haptic stimuli,integration between sensing and actuation,and spatial-temporal registration between visual and haptic *** concept of active electronic skin is promising for advancing the field of ambient haptics,enabling seamless integration of touch into our digital and physical surroundings.

关键词： Active ambient electronic

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Color liquid crystal grating based color holographic 3D display system with large viewing angle

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Light(Science & Applications) 2024年第1期13卷 103-112页

作者： Di Wang Yi-Long Li Fan Chu Nan-Nan Li Zhao-Song Li Sin-Doo Lee Zhong-Quan Nie Chao Liu Qiong-Hua Wang School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Display Technology Research Center Seoul National UniversityGwanak-ro 1Gwanak-guSeoul 08826Republic of Korea Key Lab of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

Holographic 3D display is highly desirable for numerous applications ranging from medical treatments to military ***,it is challenging to simultaneously achieve large viewing angle and high-fidelity color reconstruction due to the intractable constraints of existing ***,we conceptually propose and experimentally demonstrate a simple and feasible pathway of using a well-designed color liquid crystal grating to overcome the inevitable chromatic aberration and enlarge the holographic viewing angle,thus enabling large-viewing-angle and color holographic 3D *** use of color liquid crystal grating allows performing secondary diffraction modulation on red,green and blue reproduced images simultaneously and extending the viewing angle in the holographic 3D display *** principle,a chromatic aberration-free hologram generation mechanism in combination with the color liquid crystal grating is proposed to pave the way for on such a superior holographic 3D *** proposed system shows a color viewing angle of~50.12°,which is about 7 times that of the traditional system with a single spatial light *** work presents a paradigm for achieving desirable holographic 3D display,and is expected to provide a new way for the wide application of holographic display.

关键词： holographic angle crystal

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Discriminative feature encoding for intrinsic image decomposition

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Computational Visual Media 2023年第3期9卷 597-618页

作者： Zongji Wang Yunfei Liu Feng Lu Key Laboratory of Network Information System Technology(NIST) Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100190China State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijing 100191China Peng Cheng Laboratory Shenzhen 518000China

Intrinsic image decomposition is an important and long-standing computer vision *** an input image,recovering the physical scene properties is *** physically motivated priors have been used to restrict the solution space of the optimization problem for intrinsic image *** work takes advantage of deep learning,and shows that it can solve this challenging computer vision problem with high *** focus lies in the feature encoding phase to extract discriminative features for different intrinsic layers from an input *** achieve this goal,we explore the distinctive characteristics of different intrinsic components in the high-dimensional feature embedding *** define feature distribution divergence to efficiently separate the feature vectors of different intrinsic *** feature distributions are also constrained to fit the real ones through a feature distribution *** addition,a data refinement approach is provided to remove data inconsistency from the Sintel dataset,making it more suitable for intrinsic image *** method is also extended to intrinsic video decomposition based on pixel-wise correspondences between adjacent *** results indicate that our proposed network structure can outperform the existing state-of-the-art.

关键词： intrinsic image decomposition deep learning feature distribution data refinement

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SkeletonMix: A Mixup-Based Data Augmentation Framework for Skeleton-Based Action Recognition

SkeletonMix: A Mixup-Based Data Augmentation Framework for S...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Zongye Zhang Huanyu Zhou Qingjie Liu Yunhong Wang State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Skeleton-based human action recognition has received widespread attention for its robustness to changes in the background and appearance of actors compared to the RGB modality. Data augmentation is widely used to explicitly regularize the model to prevent overfitting, especially when the number of labeled samples is scarce. However, compared to various augmentation methods available for the RGB modality, there are fewer works on the skeleton modality, especially a model-agnostic augmentation method that can be easily integrated into multiple models. We address the problem by proposing a comprehensive data augmentation framework named SkeletonMix, which contains a pair sample selection module for mixup and random augmentations tailored for skeleton modality. SkeletonMix is a non-learning framework and can be applied to different models in a plug-and-play manner. Extensive experiments on NTU RGB+D, NTU RGB+D 120 and PKU-MMD datasets demonstrate the effectiveness of our proposed framework under limited labeled training data. Our proposed method boosts the performance by a maximum of 7.5% on scarce training data setup (5% of training data).

关键词： Training data Speech recognition Signal processing Data augmentation Skeleton Robustness Data models Human activity recognition Speech processing Overfitting

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Research on Object Oriented Plan Management system modeling 18

Research on Object Oriented Plan Management System modeling

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18th IEEE Conference on Industrial Electronics and Applications, ICIEA 2023

作者： Chang, Junjun Yang, Chao Xiao, Jin Southwest China Research Institute of Electronic Equipment Chengdu China Beihang University The State Key Lab of Virtual Reality Technology and Systems Beijing China

ISBN: (纸本)9798350312201

Under the background that the manufacturing industry is facing the digital transformation, the demand for business modeling is increasingly urgent. Only through business modeling can business processes, business rules and the authority and boundary of roles be sorted out, so as to solve the problem of "information island"among the information systems of various departments of the enterprise. There are many modeling languages/tools that can be applied to business modeling at home and abroad, including flowchart, Event-driven Process Chain(EPC), ICAM Definition Languages(IDEF), Business Process Model and Notation(BPMN) and Unified Modeling Language(UML), etc. Each of these languages/tools has its own advantages and disadvantages. Business modeling under the background of digital transformation is not limited to the traditional "description"of business processes and business rules, but more to find a modeling method, starting from the needs of the organization, step by step to "develop"a business system in line with the expectations of the organization;However, at present, the academic and industrial research on this aspect is very little. Inspired by the history of software development methodology shifting from a process-oriented to an object-oriented method, this paper considers business modeling based on UML and object-oriented method. There are many object-oriented modeling methods. Through research, we find that HarmonySE method can be applied to business modeling to meet the needs of business modeling under the background of digital transformation. Then, it details how to model a plan management system based on UML and HarmonySE methodologies on Astah Professional, a UML modeling tool. Finally, the advantages of business modeling based on UML and HarmonySE are described. © 2023 IEEE.

关键词： Unified Modeling Language

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Flight Simulator Column Force Modeling by system Identification 23

Flight Simulator Column Force Modeling by System Identificat...

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15th International Conference on Computer Modeling and Simulation, ICCMS 2023

作者： Cai, Xiangqun Lei, Xiaoyong Dai, Shuling Li, Weiqi State Key Lab. of Virtual Reality Technology and Systems Beihang University China School of Automation Science and Electrical Engineering Beihang University China

ISBN: (纸本)9798400707919

In this work, a modeling method of aircraft control column force based on system identification is proposed. Using the data of "lever force displacement"and "lever release"tests, the column force model of the longitudinal channel of the control system is established, and least square method is used to identify the model parameters. The acquired model is used for the simulation of the irreversible hydraulic control system, and the simulation results are compared with test results. It is indicated that the simulation accuracy meets the requirements of CCAR 60 for the column force model of the simulator control system. The proposed model has a simple structure and high computational efficiency. The identification method is independent of the original design parameters of the control system and has good robustness. © 2023 ACM.

关键词： Flight simulators

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The Approach of Equipment Degradation Processes Considering Self-Recovery Characteristics 14

The Approach of Equipment Degradation Processes Considering ...

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14th International Conference on Reliability, Maintainability and Safety, ICRMS 2023

作者： Zhou, Weixuan Lv, Chuan Geng, Jie Jin, Yuxue Zhang, Miao Gao, Zhuoying School of Reliability and Systems Engineering Beihang University Beijing China State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Key Laboratory of Reliability and Environmental Engineering Beihang University Beijing China

ISBN: (纸本)9798350329988

Recent research in the process of equipment state evolution emphasizes the comprehensive consideration of the event process. However, the process does not consider the self-recovery capability of equipment in detail. In view of this problem, a detailed explanation of the self-recovery characteristics is given. Subsequently, a self-recovery model for equipment is established. Furthermore, the degradation process considering self-recovery is established. Finally, a numerical analysis is carried out to give the degradation process curve with self-recovery characteristics. The result shows that the degradation process can reflect the state evolution process more comprehensively for the equipment with self-recovery capability. © 2023 IEEE.

关键词： Degradation process Gamma process Self-recovery Shock process

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